Aether RiftEnchantment
At the beginning of your upkeep, discard a card at random. If you discard a creature card this way, return it from your graveyard to the battlefield unless any player pays 5 life.

Agonizing DemiseInstant
Kicker (You may pay an additional as you cast this spell.)Destroy target nonblack creature. It can't be regenerated. If Agonizing Demise was kicked, it deals damage equal to that creature's power to the creature's controller.

Armored GuardianCreature
— Cat Soldier (2/5) : Target creature you control gains protection from the color of your choice until end of turn.: Armored Guardian gains shroud until end of turn. (It can't be the target of spells or abilities.)

Atalya, Samite MasterLegendary Creature
— Human Cleric (2/3) , : Choose one —• Prevent the next X damage that would be dealt to target creature this turn. Spend only white mana on X.• You gain X life. Spend only white mana on X.